1/2 a^{a1,v1}_{a0,v0} b^{c0}_{a2} c^{c3,a3}_{c1,c2} eta1^{a2}_{a1} gamma1^{a0}_{a3} a+(c1) a+(c2) a+(v0) a-(v1) a-(c3) a-(c0)
+1/2 a^{a1,v1}_{a0,v0} b^{c0}_{a2} c^{c3,a3}_{c1,c2} lambda2^{a0,a2}_{a1,a3} a+(c1) a+(c2) a+(v0) a-(v1) a-(c3) a-(c0)